Knowledge Bank

The infrared spectra of several oxides of alkali metal have been observed. These, formed by reaction of the metals with oxygen and trapped in a solid krypton matrix at $20\circ K$, consist primarily of peroxides. $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O-18O$ isotope shifts have been used to facilitate the assignments and force constant calculations.